Engine



Jan. 10, 1933. R. H. FARWELL.

ENGINE Filed July 31, 1950 w zii Patented Jan. 10, 1933 RAYMOND HILLFARWELL, OF GROTON,

PATENT OFFICE CONNECTICUT, .ASSIGNOR 'I'O MICHELL- CBANKLESS ENGINESCORPORATION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK ENGINEApplication filed July 31,

This invention relates to engines and particularly to internalcombustion engines and to scavenging means therefor.

' The invention has for its salient object to provide an engine withscavenging means including a pump and conduits connecting the pump tothe engine cylinders and so constructed and arranged as to be disposedwithin the engine casing, thereby reducing the dimensions of the engineand strengthening the casing.

Further objects of the invention will ap pear from the followingspecification taken in connection with the drawing, which forms a partof this application, and in which Fig. 1 is a longitudinal elevation,partly in section, of an engine constructed in accordance with theinvention; and

Fig. 2 is a transverse sectional elevation taken substantially on line2-2 of Fig. 1.

The invention briefly described consists of an engine comprising aplurality of cylinders, a scavenging pump disposed preferably at one endof the engine and conduits connecting the pump casingwith the cylinders.The conduits are formed within the engine casing and extendlongitudinally thereof. At their outlet ends, the conduits communicatewith an annular chamber which in turn is adapted to communicate throughsuitable ports with the cylinders, the communication through the portsbeing controlled by the working pistons in the cylinders.

Further details of the invention will appear from the followingdescription.

In the form of the invention illustrated in the drawing, there is shownan engine comprising three sections, A, B and C. The engine shaft 10 ismounted in suitable hearings in the sections A and C and extends throughthe central section B.

The engine particularly illustrated in the drawings transmits thereciprocating motion of the pistons to the shaft 10 by means of a pairof swash plates or slants 11 and 12 which are fixed to the'shatt, andare disposed respectively in the sections A and C of the engine casing.The cylinders are disposed parallel to the shaft and are concentricallyarranged, as shown in Fig. 2, six cylinders, 20,

1930. Serial N'0. 471K985 formed in one section or, as shown in Fig. 1,

in two sections, 32 and 33, which are connected together.

Each cylinder has mounted therein a pair of oppositely acting pistons 35and 36, each piston having secured thereto a rod 37 having a yoke 38.The yokes straddle the swash plate and each yoke has a pair of slipperpads 39 a'nd40 which communicate the reciprocating motion of the pistonto the swash plate and have bearing surfaces engaging the opposite facesof the swash plate. Une or more of the yokes 38 has secured thereto andextending'therebeyond in axial alinement with the piston rod anextension rod on the end of which is mounted a piston 46. The piston 46is disposed in a pump cylinders? formed in the outer end of the sectionC of the engine casing. The pump cylinder 47 cominunicates with a valvechamber 48 in which is mounted a rotary valve 49.

The valve chamber 48 has suitable intake and discharge ports whichcommunicate with a plurality of ducts or conduits 50 which, as shown inFig. 2, are disposed alternately with relation to the cylinders of theengine. The conduits 50 are formed on the inside of the casing and inFig. 2 are shown as angular in cross section. The disposition of theconduits within the casing has two important advantages, namely,reducing the outside dimensions of the engine and strengthening theengine casing. The valve i9 and the outlet ports between the valvecasing and the conduits are so relatively constructed and arranged that,as the valve is rotated by the shaft, the valve casing having acompressed charge of air therein will communicate successively with theducts or conduits 50. The conduits 5O discharge into an annular chamber55 which is in communication with the 5 ports 31 and cylinders 20 to 25inclusive. As

the pistons uncover the ports 31 the scavenging charge of air enters thecylinders and effectively discharges the burnt gases therefrom andscavenges the cylinders. The exhaust ports are shown at 41.

Although the reciprocating type of scavenge pump is illustrated, it willbe understood that any desired form of pump may be utilized to dischargethe compressed air into the ducts or conduits from which the air passesinto the cylinders.

In the form of the invention illustrated in Fig. 1, the cylinders arebolted to the end sections A and C and these sections are also connectedby a central sleeve 60 which is secured to the end sections by bolts 61.

It will be obvious from the foregoing description that the engineconstructed in the manner set forth will be compact and that theprovision of the air ducts or conduits within the casing of the enginewill cut down the dimensions of the engine and effectively strengthenthe casing structure.

Although one specific embodiment of the invention has been particularlyshown and described, it will be understood that the invention is capableof modification and that changes in the construction and in thearrangement of the various cooperating parts may be made withoutdeparting from the spirit or scope of the invention, as expressed in thefollowing claims.

What I claim is:

1. An internal combustion engine comprising an engine casing, a shafttherein, a plurality of cylinders arranged parallel to andcircumferentially around the shaft, pistons in said cylinders, operativeconnections between said pistons and said shaft, a pump disposed at oneend of the casing and driven by the engine, and conduits formedintegrally in said casing connecting the pump to the cylinders saidconduits being located circumferentially around the shaft and eachconduit being disposed between two cylinders.

52. An internal combustion engine comprising an engine casing, a shafttherein, a plurality of cylinders arranged parallel to the shaft,pistons in said cylinders, operative connections between said pistonsand said shaft, a pump disposed at one end of the casing and driven bythe engine, and conduits disposed within said casing connecting the pumpto the cylinders, said conduits being disposed alternately with saidcylinders.

3. An internal combustion engine comprising an engine casing, a.plurality of cylinders having ports therein, working pistons in saidcylinders controlling said ports, an annular chamber surrounding saidcylinders and having an axis parallel to the cylinder axes, said chambercommunicating with said ports, an air pump at one end of the casin andconduits connecting said pump with said chamber.

4:. An internal combustion engine comprising an engine casing, aplurality of cylinders having ports therein, working pistons in saidcylinders controlling said ports, a chamber surrounding said cylindersand communicating with said ports, an air pump at one end of the casing,and conduits within the fiasing connecting said pump with said cham- 5.An internal combustion engine comprising an engine casing, an engineshaft, a plurality of cylinders having their axes parallel to said shaftand having ports therein, working pistons in said cylinders controllingsaid ports, a chamber surrounding said cylinders and communicating withsaid ports, an air pump at one end of the casing, said chamber beingspaced from said pump, and conduits connecting said pump with saidchamber.

RAYMOND HILL FARWELL.

